The programme reconstructs the events that occurred at the property, near Kingswood Golf Course, on Wednesday November 12.

Millionaire businessman Robert Stiff, who owns the property, will feature on the show along with his wife, Catherine, and daughter, Chole.

Surrey Police said a lone intruder entered the home at around 5.45pm and forced the occupants - Catherine, Chloe and her pregnant sister, Katie - to remove and hand over expensive jewellery before assaulting the women.

Police said previously the suspect was believed to be carrying a firearm.

During the reconstruction, the Stiffs will make an emotional plea to anyone who has information regarding the burglary to come forward.

In the appeal, Catherine said: "[The intruder] went to Katie and he booted her in the side of her tummy where she's pregnant. And he booted her one, and I just thought: 'Oh god, what's going to happen to that baby?"

Chloe said: "Because, although what happened on that night was traumatic, it's the after-effects of what he's left behind that's even worse."

In the Crimewatch appeal, Mr Stiff - who sold his healthcare recruitment company Team24, to the Capita Group, for more than £25 million - calls the attacker a "coward" for assaulting his loved ones.

The construction shows how the victims were forced to lie face down and tied up

Detective Chief Inspector Antony Archibald, the senior investigating officer said: "This was a horrifying ordeal for the family involved, they believed they were going to come to some serious harm, it is every family's worst nightmare.

"The family's eldest daughter is expecting their first grandchild and was heavily pregnant at the time of the offence; this did not seem to affect the intruder, who kicked her and her mother and sister in the stomach even after they had given in to his demands.

"They were fully compliant throughout the incident.

"In the time which has past, I believe the offender will have confided in someone about the offence but he probably failed to mention that he violently assaulted a pregnant woman.

DCI Archibald, who will appear on the show, added: "I believe the family was specifically targeted because the burglars had very detailed demands and I am sure someone will be able to piece all of these pieces together and provide us with a name for the offender.

"I would also urge anyone who has been offered any of the stolen items for sale or who knows a person who has suddenly come into possession of such an item and has their suspicions about them to provide information.

"Someone, somewhere knows who is responsible for the appalling attack and I would urge them to contact police. "

The intruder forced the women upstairs to gain access to a safe containing high-value jewellery

Crimewatch editor Joe Mather said: "We are hopeful that our accurate reconstruction made in close collaboration with Surrey Police will encourage viewers to contact the programme with the crucial information needed to catch this dangerous offender and help bring some piece of mind to the Stiff family.”

Anyone with information on this incident is urged to contact East Surrey CID on 01483 631239 quoting Op Vesuvius. Information can be passed to the independent charity Crimestoppers anonymously on 0800 555 111 where you may be eligible for a reward if your evidence leads to the arrest and conviction of a person responsible.